Valve chuck



Jan. 9, 1923. 4 1,441,625.

H. E. FLETCHER.

VALVE CHUCK.

FILED 1AN.30,1922.

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verve CHUCK.

Application filed January 3D, 1922. Serial N0. 532,932.

exact description of the same, such as will ena-ble others skilled in the art towhich it appertains to malte and use the same.

rlhis application is a continuation in part ot my copending application, Serial Number 494,463, tiled August 18, 1920. f

The present invention'relates particularly to valve stem holding chucks, adapted `to be used with the type of valve grinding inachine described in myy copending application hereinbet'ore referred to, but its use is not limited speciiically to suoli.

The primary object ot' the invention is to provide a valve chuck which may be easily and readily adjusted so that the tace of the valve to be ground may at all times be retained in proper position.

An additional object is to provide achucl; ot this character having means to center and maintain the inner end ot a valve stem in alignment with the chuck jaws at all times.

A further object is to provide a chucl: ot the character mentioned so constructed as to allow a greater degree of movement ot the chuck jaws than is usual in 'the art, permitting its adaptability to valve stemsot any size, without changing.

With these and such other objects in view as will be apparent from the following description, my invention resides in the novel features of construction, combination and arrangement ot parts hereinafter described and claimed, and illustrated in the accompanying drawings.

ln the drawings:

Figure 1 is a side elevation 03E the chuck, mounted;

Figure 2 is a horizontal section on line 2-2 ot Figure 1; v

Figure 3 is a vertical section on line 343 ot Figure 2;

Figure 4 is an elevation of the chuck jaw spindle; and,

Figure 5 is an end elevation of the jaws.

ln detail, the chuck comprises a circular base member 1, adapted to b-e pivotally mounted on a support 2, forming part ot' a grinding machine, in this instance. A pair ot arms 3, integral with the base,l extend upL wardly therefrom and carry on their `upper ends an integral sleeve 4, forming a bearing for the chucl; proper. and sleeve 4, form in eil'ect a holder which may be rotated on the support 2 over the support stein 5 extending therefrom and threaded at its upper end to receive a nuty 6 whereby the base 1 may be clamped in any desired position, the position being regulated by means of graduations 7 on the periphery of the base member.

The sleeve 4 is formed at one end with a depending arm'8 carrying a bearing 9 on the lower end thereof in which is `journalled `a shaft 10 connected with suitable driving mechanism (not shown)` and carrying at its end, a pulley 11 `for a purpose `hereinafter described.

lotatably mounted `in the sleeve 4, is a `hollow cylindrical chuck spindle 12 extending beyond the ends of `the sleeve and provided at one end with an enlarged head 13. rlhe opposite end ot the spindle has secured thereto in any suitable manner, a pulley 14 disposed above the pulley 11 so that the spindle may be rotated through the medium ot driving connection (not shown) between the pulleys. Lubricating cups 15 are provided at the top of the sleeve 4.

As a means ot locking the chuck spindle against rotation, l provide a slotted bolt 16 secured on the sleeve 4 by retaining screws 17. The locking bolt is slid longitudinally ol the sleeve by means ot' a handle 18, and is termed at one end with a tongue 19 adapted to engage in any of a series ot circum erentially spaced sockets Y2O on the inner tace of the pulley 14.

Arranged within the spindle 12 is a tube 21 having the split jaws 22 termed along the greater portion thereof, the slots between the jaws being of relatively large width to allow considerable degree .of jaw movement. The jaws project in enlarged heads 23 beyond one end of the spindle, and at the opposite end the tube projects beyond the spindle and pulley 14 terminating in a threaded portion on which is received a hand wheel Thebase 1, arms 3k 24 by manipulation of which the tube may to slide in a corresponding recess in the head 13. This tube 21 is splined to the spindle 12 fby a key 21 so that the tube maymove vided in the tube 2l to receive said key. Sldably mounted Within the tube is a block and arranged between the block and the hand Wheel, is an expansion spring 26. The

priv end of the block 25 is provided With "a conical socket 27 to receive and center-the, i end of a valve stern 28 held in ythe chuck jaws.` Itvvill be seen that the c chuck thus consists ofV a spindle having. a draiv-incollet.

In operation, a, valve stein, is inserted in thefchuck jaws and centered in they socket of the, springl tensionedl block 25. The hand Wheel 24 is then operated to bring-the jaws into gripping engagement With ther stern, and the jaws `being held in frictiona-l engageN nient against the spindlevhead 13, the valve will, he rotatedy on. rotationeof the spindle, as described. i n i `While I have described certain elements entering into the construction and operation of the preferred embodiment of my invention, I desire lvit to be understood that I do not limit myself to these, but that any such maybeused as will fall Within the scope of the invention, asA claimed.

I claim:

A chuck of the character describedfincludingratsleeve having squared ends, a tubular chuck spindle having a body journalled in said sleeve and'projecting at each end therei'rornythe forward end of said body being shouldered to bear against they vforward squared end of the sleeve, a belt pulley mounted on the rear end of said body and fixed thereto, said belt; pulley engaging the rear squared end of the sleeve yto hold the spindle therein, a tubular draw-in collet Inountedwithin the spindle fory longitudinal n'ioveinent and splined theretothe-,rear end of said, draw-in collet being threaded and projecting from the spindle, a plunger slidable in said collet, a spring having one end bearing against the plunge@ and a hand Wheel screwed on the threaded collet end and bearing against the rear end of the splindle, said hand Wheel serving to close the rear endl of the tubular colletvand forming a bearing for the othery endl of said spring.

In Witness whereof` I have hereunto set my hand.y

HERBERT n FLETCHER( 

